Question: Which country of Brest ended on March 17th, 1921?
Paraphrase: ended on brest on Match 17th, 1921, what country was it?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q140147 p:P17 ?s . ?s ps:P17 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1921')) }